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dc.contributor.authorRose, Calvin W
dc.contributor.authorShellberg, Jeffrey G
dc.contributor.authorBrooks, Andrew P
dc.description.abstractAlluvial gullies are often formed in dispersible sodic soils along steep banks of incised river channels. Field data collected by Shellberg et al. (2013b) from a gully outlet in northern Australia showed little hysteresis between water discharge and fine (<63 孩 and coarse (>63 孩 suspended sediment, indicating transport-limited rather than source-limited conditions. The major source of the fine (silt/clay) component was the sodic soils of upstream gully scarps, and the coarser (sand) component was sourced locally from channel bed material. In this companion paper at the same study site, a new method was developed for combining the settling velocity characteristics of these two sediment source components to estimate the average settling velocity of the total suspended sediment. This was compared to the analysis of limited sediment samples collected during flood conditions. These settling velocity data were used in the steady-state transport limit theory of Hairsine and Rose (1992 a,b) that successfully predicted field data of concentrations and loads at a cross-section, regardless of the complexity of transport-limited upstream sources (sheet erosion, scalds, rills, gullies, mass failure, bank and bed erosion, other disturbed areas). The analysis required calibration of a key model parameter, the fraction of total stream power (F 蠰.025) that is effective in re-entraining sediment. Practical recommendations are provided for the prediction of sediment loads from other alluvial gullies in the region with similar hydrogeomorphic conditions, using average stream power efficiency factors for suspended silt/clay (Fw 蠰.016) and sand (Fs 蠰.038) respectively, but with no requirement for field data on sediment concentrations. Only basic field data on settling velocity characteristics from soil samples, channel geometry measurements, estimates of water velocity and discharge, and associated error margins are needed for transport limit theory predictions of concentration and load. This theory is simpler than that required in source-limited situations. This article is protected by copyright. All rights reserved.
dc.publisherJohn Wiley & Sons
dc.publisher.placeUnited Kingdom
dc.relation.ispartofjournalEarth Surface Processes and Landforms
dc.subject.fieldofresearchGeomorphology and Regolith and Landscape Evolution
dc.subject.fieldofresearchPhysical Geography and Environmental Geoscience
dc.titleModelling suspended sediment concentration and load in a transport-limited alluvial gully in Northern Queensland, Australia
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.facultyGriffith Sciences, Griffith School of Environment
gro.hasfulltextNo Full Text
gro.griffith.authorRose, Calvin W.
gro.griffith.authorBrooks, Andrew P.
gro.griffith.authorShellberg, Jeffrey G.

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